IMac (Mid 2011) Does not wake up after long sleep

Hi People,
Having issues with my Mid2011 iMac (21,5", 2.7GHz). Just upgraded to 12GB RAM (2x2GB original + 2x4GB). System runs fine, no issues.
But when system goes to sleep for a longer period (a few hours) it will not wake up again. Neither by Keyboard/Mouse interaction (Bluetooth as well as USB) nor by pushing the powerbutton. I also performed the PRAM and SMC reset as described in the apple support resources.
Feeling a bit lost. Any Ideas?
Thanks in advance for any help!

Addition:
Performed a test of the RAM with memtest. No erros found. Also forget to mention that the Mac has also Software updates and firmware updates installed.

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